Designation: C 1064/C 1064M – 99

Standard Test Method for

Temperature of Freshly Mixed Portland Cement Concrete1
This standard is issued under the fixed designation C 1064/C 1064M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

concrete to 61°F [60.5°C] throughout a range of 30° to 120°F
[0° to 50°C]. The temperature measuring device shall require
immersion of 3 in. [75 mm] or less during operation.
4.3 Partial immersion liquid-in-glass thermometers (and
possibly other types) shall have a permanent mark to which the
device must be immersed without applying a correction factor.
4.4 Reference Temperature Measuring Device, shall be
readable and accurate to 6 0.5°F [0.2°C] at the verification
points in 5.1. A certificate or report that verifies the accuracy
shall be available in the laboratory for review. The certificate or
report shall provide documentation that the reference standard
used in the verification is traceable to NIST.

1. Scope
1.1 This test method covers the determination of temperature of freshly mixed portland cement concrete.
1.2 The values stated in inch-pound or SI units are to be
regarded separately as standard. Within the text, SI units are
shown in brackets. The values stated in each system are not
exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems
may result in nonconformance with the specification.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the

responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

5. Calibration of Temperature Measuring Device
5.1 Each temperature measuring device used for determining temperature of freshly mixed concrete shall be calibrated
annually, or whenever there is a question of accuracy. This
calibration shall be performed by comparing the readings of the
temperature measuring device at two temperatures at least
30°F [15°C] apart.
5.2 Calibration of the temperature measuring devices may
be made in oil or other suitable baths having uniform density
if provision is made to:
5.2.1 Maintain the bath temperature constant within 0.5°F
[0.2°C] during the period of the test.
5.2.2 Have both the temperature and reference temperature
measuring devices maintained in the bath for a minimum of 5
min before reading temperatures.
5.2.3 Continuously circulate the bath liquid to provide a
uniform temperature.
5.2.4 Slightly tap thermometers containing liquid to avoid
adhesion of the liquid to the glass if the temperature exposure
is being reduced.

2. Referenced Documents
2.1 ASTM Standards:
C 172 Practice for Sampling Freshly Mixed Concrete2
3. Significance and Use
3.1 This test method provides a means for measuring the
temperature of freshly mixed concrete. It may be used to verify
conformance to a specified requirement for temperature of
concrete.

3.2 Concrete containing aggregate of a nominal maximum
size greater than 3 in. [75 mm] may require up to 20 min for the
transfer of heat from aggregate to mortar. (See ACI Committee
207.1R Report.3)
4. Apparatus
4.1 Container, shall be made of nonabsorptive material and
large enough to provide at least 3 in. [75 mm] of concrete in all
directions around the sensor of the temperature measuring
device; concrete cover must also be at least three times the
nominal maximum size of the coarse aggregate.
4.2 Temperature Measuring Device, shall be capable of
accurately measuring the temperature of the freshly mixed

6. Sampling Concrete
6.1 The temperature of freshly mixed concrete may be
measured in the transporting equipment provided the sensor of
the temperature measuring device has at least 3 in. [75 mm] of
concrete cover in all directions around it.
6.2 Temperature of the freshly mixed concrete may be
obtained following concrete placement using the forms as the
container.
6.3 If the transporting equipment or placement forms are not
used as the container, a sample shall be prepared as follows:
6.3.1 Immediately, prior to sampling the freshly mixed

1
This test method is under the jurisdiction of ASTM Committee C-9 on Concrete
and Concrete Aggregates and is the direct responsibility of Subcommittee C09.60 on
Fresh Concrete Testing.
Current edition approved July 10, 1999. Published September 1999. Originally

published as C 1064 – 86. Last previous edition C 1064 – 86 (1993).
2
Annual Book of ASTM Standards, Vol 04.02.
3
Available from American Concrete Institute, Box 9094, Farmington Hills, MI
48333.

Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.

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C 1064/C 1064M
concrete, dampen (with water) the sample container.
6.3.2 Sample the freshly mixed concrete in accordance with
Practice C 172, except that composite samples are not required
if the only purpose for obtaining the sample is to determine
temperature.
6.3.3 Place the freshly mixed concrete into the container.
6.3.4 When concrete contains a nominal maximum size of
aggregate greater than 3 in. [75 mm], it may require 20 min
before the temperature is stabilized after mixing.

7.2 Leave the temperature measuring device in the freshly
mixed concrete for a minimum period of 2 min or until the
temperature reading stabilizes, then read and record the temperature.
7.3 Complete the temperature measurement of the freshly
mixed concrete within 5 min after obtaining the sample.
8. Report
8.1 Record the measured temperature of the freshly mixed

concrete to the nearest 1°F [0.5°C].

7. Procedure
7.1 Place the temperature measuring device in the freshly
mixed concrete so that the temperature sensing portion is
submerged a minimum of 3 in. [75 mm]. Gently press the
concrete around the temperature measuring device at the
surface of the concrete so that ambient air temperature does not
affect the reading.

9. Precision and Bias
9.1 The precision and bias of this test method have not been
determined. A precision and bias statement will be included
when sufficient test data have been obtained and analyzed.

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